Internal Structure of Massive Terrestrial Planets

Details Internal Structure of Massive Terrestrial Planets Internal Structure of Massive Terrestrial Planets

2005-11-04

arxiv.org/abs/astro-ph/0511150v1

Astronomy and Astrophysics

Astrophysics

29 pages, 2 tables, 8 figures. In review in Icarus International Journal

Scientific paper

10.1016/j.icarus.2005.11.021

Planetary formation models predict the existence of massive terrestrial planets and experiments are now being designed that should succeed in discovering them and measuring their masses and radii. We calculate internal structures of planets with one to ten times the mass of the Earth (Super-Earths) in order to obtain scaling laws for total radius, mantle thickness, core size and average density as a function of mass. We explore different compositions and obtain a scaling law of $R\propto M^{0.267-0.272}$ for Super-Earths. We also study a second family of planets, Super-Mercuries with masses ranging from one mercury-mass to ten mercury-masses with similar composition to the Earth's but larger core mass fraction. We explore the effect of surface temperature and core mass fraction on the scaling laws for these planets. The scaling law obtained for the Super-Mercuries is $R\propto M^{\sim0.3}$.

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